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x in (-oo:+oo)
(1/9)*(x+18)+(1/8)*(x+8) = x-8 // - x-8
(1/9)*(x+18)+(1/8)*(x+8)-x+8 = 0
1/9*(x+18)+1/8*(x+8)-x+8 = 0
1/9*(x+18)+1/8*(x+8)-x+8 = 0
17/72*x-x+3+8 = 0
3-55/72*x+8 = 0
11-55/72*x = 0
11-55/72*x = 0
11-55/72*x = 0 // - 11
-55/72*x = -11 // : -55/72
x = -11/(-55/72)
x = 72/5
x = 72/5
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